Improvement in steam-generators



S. GREENHALGH STEAM BOIL UNITED STATES PATENT OFFICE;

SOLOMON GREENHALGH, or NEWARK, NEW JERSEY.

IMPROVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 43,769. dated August 9,156?

To (tl whom it may concern.-

Be it known that I, SoLoMoN GREEN- HALGH, of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Steam-Boiler; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 represents a longitudinal vertical section of my invention; Fig. 2, a transverse vertical section of the same, the. line as m, Fig. 1, indicating the plane of section.

Similar letters of reference indicate like parts.

This invention relates to certain improvements in that class of steam-boilers which are used to generate steam for heating purposes. In such boilerstitis particularly desirable to obtain the steam as-dryas possible, so that the same in passing through the heaters in the various parts of the building to be heated will deposit the smallest possible quantity of water.

The invention consists in' the employment or use of one or more horizontal water-tubes, in combination with a series of vertical pipes forming the connection between the said water tube or tubes and one or more steamchambers and suitable fire-fines, in such a manner that the horizontal and vertical watertubes, and also the steam chambers, are exposed to the direct action of the fire from all sides, and the steam formed by the action of pipe 1), and each of them communicates, by

means of a series of vertical tubes E, with a steam-chamber, F. Thetubes E emanate from the tubes A, alternately on one and then on the opposite side, as clearly shown in Fig. 2 of the drawings, and they are made with an oval or elliptic cross-section, so that the body 'of water contained therein is" easily permeated by the heat of the fire coming in contact with the external surface of the tubes.

The steam-chambers F are constructed in the shape of inverted truncated pyramids, the cross-sections of which form tra-pezoids, as clearly shown in Fig. 2 of the drawings, or

they may be constructed in any other suitableshape or form and of any suitable material. Each of these steam-chambers, with its vertical and horizontal water-tubes, forms a complete system for itself, and they are arranged side by side, so that their upper edges are in contact with each other and a continuous flat surface is obtained. The lower part of these steam-chambers is occupied bywater up to a level with or somewhat'above the upper gagecook, a, in the water supply pipe D, and their upper part is occupied by the steam formed by the evaporation of the water in the tubes and chambers. The heat and products of combustion rise from the fire on the grate O, and they are compelled by the bridge-wall G and water-back H to pass up to the staunchambers and over thetop of the water-back. On following the lines 1), formed by the inclined sides of the said steam-chambers, the products of combustion come in contact with the abutments 0, which rise from vertical plates I into the flues b, and by these abutments and plates the heat is turned down and compelled to pass under the lower edge of the first steamoha'mber and along the abutment d, which terminates atsome distance from the front 0t said steam-chambers, so as to allow the heat to turn its front end and pass back along the second abutment, d, and finally forward again to the chimney-flue o. By means of the abutments d d the heat is circulated several times over the steam-spaces ot' the chambers F, and the steam contained therein is partially superheated before it is allowed to pass off through the steam-pipe J The lines on the upper surfaces of the steam-chambers are cleaned by means of hand-holesfin the rear wall, and a safety-valve of the ordinary construction is applied to prevent accidents from overpressure. Each of the stezun-chambers with its water-tubes is made entirelyimlepemlent of the others, and they are connected to the water and steam pipes by suitable unionjoints, as clearly shown in Fig. 1 of the draw ings. By this arrangement the operation of putting up and taking down the boiler is considerably facilitated, and the capacity of the boiler can be increased to any desired extent simply by increasing the number of its sec tions.

The heating-surface of my boiler is very extensive; it raises steam with a comparatively small expenditure of fuel, and it is of particular advantage for heating purposes because the steam is partially superheated before it is allowed to leave the boiler.

Having thus described my invention, I

I claim as new and desire to secure by Letters 

